Method of improving the permeability to air of dry plastering-mortar.



l l l CARL aueusir, narrnnnn'ann Janos Wnnnn, or nnnanrfennrranr, assreu omsro cant aueusr mrrnnnn, or nnnan'r, enmiranv.

amrnon or rirrnovnve run rnniarnmiuerrr are are or nnr rnasrnnme-non'ran inserts. lligiiiravring.

- To all whom it mizy concern Be it known that we, CARL Anotsr Karrnnrn and Jaime Wr:a1zn, subjects of the German Emperor, and residing at lElbart,

Kingdom of Bavaria, Germany, have mvented certain new and useful llmprovements in Methods of Improving the Perme ability to Air of Dry Plastering-Mortar, of which the following is a' specification.

Whereas hitherto plastering mortar was, prepared by ivet process on the job and than uiith the old fashioned method. it --Will therefore also be possible to give the dll mortar at once all desirable properties. The new plastering mortars were employed above all where the plastering was not to be subsequently coated with pamt. Very fine architectural efi'ects were obtained by stains ing the mortar, by adding granular rocks and minerals to the slaked lime. lt Was also found possible to render the mortar 'storable and to prevent a premature setting or cahng during storageor transport and on the accessof moisture, even. if setting mortar formers or binding substances were present. The dry. plastering mortars, however, still showed-the disadvantages, that they would be discolored in time and th at the plastering had a very close character in consequence of the necemity of employing mixtures of given grades of pulviform, granular and broken materials. The present invention obviates this disadvantage and produces above all a plastering material which is, permeable to air and therefore of a high hygienic value. This is based on the fact that fats or oils are added to the finished mortar or one of the mortar components.

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The inventors have found that the permeability to air is thereby doubled. by reason of the addition of oil or fat, the. dry mortar will not so readily absorb moisture, and consequently such mortar can be transported and. stored with less danger of det/erioration than the dry mortars heretofore Specifiwtion of Letters Patent.

Patented a rnamiaia.

hpplication filed august it, ran. aerial Illlo. ciijier.

used. The plasteringmaterial having such admixtures is furthermore Water repellent and will lreep its color, as soot, dust and other foreign substances will not adhere-to 'it. Any soluble salts present or hydrates of lime which have been dissolved will be prevented frompenetrating to the surface.

The oiled or fatted mortars are more elastic under use, and may therefore be composed of a poorer quality, that 1s of a lower percentage of lime. Last of all they are less liable to dry rapidly, so that even in direct sunshine fissures or brittle spotsvvill hardly;

occur.

Tn carrying out the new method of preparing plastering mortar permeable to air oilor fatty substances are added in a very small quantity to either the mortarformer, white lime, magnesia-lime, hydraulic lime or to the admixtures granulated rock, minerals, sand. instead of aMixingthem dillll rectly, theymay also be embodied in an emulsion of fatty admixture after a-suitable previous treatment. The admixtures are added to the lime during the slaking or af-. terrvard.

in preparing dryplastering anortar it will be found of advantage, to use slahed lime in form of a thick paste, after it has rested and lost its causticproperties. The

sumped lime is then dried and the fatty substances may be added either immediately after slaking or after drying and before grinding, or also after the mortar has been made after drying and grinding.

Dimculties will be encountered in disltd lltll tributing the admixtures in a uniform mgar ner. particularly if the lime paste isof a lardy character, 'bor" facilitating such distribution the oil or fat is dissolved or suspended in organic solvents (alcohol or acetone) and starch is simultaneously added. The starch or other highly molecular organic llllt substances which are added in form of a fine powder will increase the elasticity of the mortar vvithout any need of increasing the quantity of water. .Un the other hand 'thestarch will also render the finished mor lbll lllll may be add Another novel method of obviating the difficulty of obtaining a uniform mixture on the addition of oil or fat to the lime, and of injuriously affecting the setting capacity of the mortar consists in employing an emulsion of the fatty admixtures. To do 'this the inventors employ the following method: they stir lime water or thin lime milk in a vessel well with linseed oil, rape oil or .some other suitable fat or oil. The formation of this emulsion may be facilitated by heating. An-addition of gum will also be an improvement, in that it facilitates the distribution of oil in the solution. If the mixing is done sufficiently thoroughly a homogeneous fatty emulsion will be obtained whichis employed for slaking the lime. form of a paste or dried, will contain the admixture of oil in a uniformly distributed manner. The same will be the case with building or plastering mortar prepared-With such lime. The emulsion may also be found 'by using alkali, hydrate of baryta or soaps soluble in Water-instead of with lime. If the plastering mortars prepared with such emulsions are subject to the penetration of water there exist the danger that the emul'sioned components are washed out. On the other hand the oily and fatty substances will, if directly added to one of the mortar admixtures, impair the hardening process, as they will insulate the particles of the mortar former or binder andthe material or materials used therewith. Therefore the inventors when addingoil to these admixtures for plastering mortar employ oxidizable oils or fats in the following manner: One part of fine materials say sand and stone meal or also coloring earths or materials used at .the same time are carefully mixed with the water repelling substance without any Water being added and the mixture is then spread in the open air in a thin layer. The oil, say linseed oil, can quickly oxidize and be resinified. The slightly hardened mass is subsequently ground to a fine powder and then the other components of the mortar, lime or cement and certain coarser admixtures are added and all then mixed with water to a plastic paste.

lVithout an disadvantagetheoils or fats ed 'to the thinning materials, if

Lime thus slaked, either in these consist of porous, partly crumbling,

'weathered minerals, such as tailings from kaolin washing, debris of feldspar rock and thelike. Such partly decomposed rock debris, which generally also contain quartz,

are excellently suited, for preparing rough- .cast plastering mortars, and the oil will here afford beside the increased permeability to air the great advantage, that a furcombined with granular, stony or 'finely powdered materials, which consists in slaking the lime by a dilute emulsion of fat, and then adding the other components of the mortar.

2. A process for increasing the permeability to air of a dry coating mortar of lime, combined with granular stony or finely powdered materials, by slaking the lime in a dilute emulsion formed by fat, combined with a feebly alkaline liquid, and then adding the other components of the mortar.

3. A process for increasing the permeability to air of a dry coating mortar of lime,

combined with granular, stony or finely powdered materials by slaking the lime in a dilute emulsion formed of fat and lime water and then adding the other component parts. of the mortar.

4. A process for increasing the permeability to air of a dry'coating mortar, consisting of. lime, combined with granular, stony or finely powdered materials, by slak- 'ing the lime in a dilute emulsion of oil converted into an emulsion with a slightly alkaline liquid and then adding the other component parts of the mortar.

In testimony whereof we hereto afiix our signatures in the presence of two witnesses. CARL AUGUSTKAPFERER. JAKOB WEBER.

I Witnesses:

HEINRICH FIETH, GEORGE Hormrnrrsou. 

